Patent US1964830A successfully refreshed from Google Patents.
US1964830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Checkerwork for multizone regenerators
Assignee: Individual
•
Filing: 1931-09-11
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Granted: 1934-07-03
•
Expires: 1951-09-11
Abstract
No abstract record available.
Inventors
- 👤 Pohl Hans
- 👤 Schack Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:11
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/02; C21B9/06; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/03; Y10S165/031
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-07-02 | 1938-01-01 | 1938-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-07-02 | 1942-01-01 | 1942-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-07-02 | 1946-01-01 | 1946-07-03 | $7700.00 | Window Closed / Lapsed |